#include <WiFi.h>
#include <WiFiClientSecure.h>  // ← ADD THIS for HTTPS

/* ================= ULTRASONIC SENSOR ================= */
#define TRIG_PIN 32
#define ECHO_PIN 33

long duration;
float distance;

/* ================= WIFI DETAILS ================= */
const char* ssid     = "Wokwi-GUEST";
const char* password = "";

/* ================= EMAIL API DETAILS ================= */
const char* host = "www.circuitdigest.cloud";
const int   port = 443;  // ← CHANGED to HTTPS port

const char* apiKey   = "cd_fir_020626_oPZv1N";
const char* toEmail  = "[email protected]";//22200000033333
const int   templateID = 1001;

/* ================= FLAGS ================= */
bool emailSent = false;

/* ================= READ DISTANCE ================= */
float readDistance() {
  digitalWrite(TRIG_PIN, LOW);
  delayMicroseconds(2);

  digitalWrite(TRIG_PIN, HIGH);
  delayMicroseconds(10);
  digitalWrite(TRIG_PIN, LOW);

  duration = pulseIn(ECHO_PIN, HIGH, 30000);
  distance = duration * 0.034 / 2;

  return distance;
}

/* ================= SEND EMAIL ================= */
void sendEmail(float dist) {
  WiFiClientSecure client;  // ← CHANGED to secure client
  client.setInsecure();     // ← ADD THIS (skip certificate validation)
  
  if (!client.connect(host, port)) {
    Serial.println("❌ Server connection failed");
    return;
  }

  /* -------- COMPLETE TEMPLATE PAYLOAD -------- */
  String payload = "{";
  payload += "\"to_email\":\"" + String(toEmail) + "\",";
  payload += "\"template_id\":1001,";
  payload += "\"variables\":{";
  payload += "\"subject\":\"Ultrasonic Sensor Alert\",";
  payload += "\"title\":\"Distance Critical\",";
  payload += "\"description\":\"Object detected below 30cm safety threshold.\",";
  payload += "\"var1\":\"Sensor Reading\",";
  payload += "\"var2\":\"" + String(dist, 2) + " cm\"";
  payload += "}}";

  Serial.println("Payload:");
  Serial.println(payload);

  /* -------- HTTP REQUEST -------- */
  client.println("POST /api/v1/email/send HTTP/1.1");
  client.println("Host: www.circuitdigest.cloud");
  client.println("Authorization: " + String(apiKey));
  client.println("Content-Type: application/json");
  client.println("Content-Length: " + String(payload.length()));
  client.println("Connection: close");
  client.println();
  client.println(payload);

  /* -------- WAIT FOR RESPONSE -------- */
  unsigned long timeout = millis();
  while (!client.available()) {
    if (millis() - timeout > 10000) {
      Serial.println("❌ Server timeout");
      client.stop();
      return;
    }
  }

  /* -------- STATUS LINE -------- */
  String statusLine = client.readStringUntil('\n');
  Serial.println("STATUS: " + statusLine);

  /* -------- SKIP HEADERS -------- */
  while (client.available()) {
    String line = client.readStringUntil('\n');
    if (line == "\r") break;
  }

  /* -------- RESPONSE BODY -------- */
  String body = client.readString();
  Serial.println("BODY:");
  Serial.println(body);
  
  client.stop();
}

/* ================= SETUP ================= */
void setup() {
  Serial.begin(9600);

  pinMode(TRIG_PIN, OUTPUT);
  pinMode(ECHO_PIN, INPUT);

  Serial.println("\nConnecting to WiFi...");
  WiFi.begin(ssid, password);

  while (WiFi.status() != WL_CONNECTED) {
    delay(500);
    Serial.print(".");
  }

  Serial.println("\n✅ WiFi Connected");
  Serial.print("IP Address: ");
  Serial.println(WiFi.localIP());
}

/* ================= LOOP ================= */
void loop() {
  float dist = readDistance();
  Serial.println(dist);

  /* ---- TRIGGER EMAIL BELOW 30 cm ---- */
  if (dist > 0 && dist < 30 && !emailSent) {
    Serial.println("🚨 Distance below 30 cm — sending email");
    sendEmail(dist);
    emailSent = true;
  }

  /* ---- RESET WHEN OBJECT MOVES AWAY ---- */
  if (dist >= 30) {
    emailSent = false;
  }

  delay(1000);
}